广西东平富Ga含锰岩系碳、氧同位素特征及意义

发布时间：2018-03-24 22:43

  本文选题：锰矿床　切入点：Ga异常　出处：《地球科学》2017年09期

【摘要】：在广西东平碳酸锰矿含锰岩系中发现Ga含量高异常,Ga含量为5.16×10~(-6)~82.80×10~(-6),平均含量为33.76×10~(-6),达到了Ga矿资源工业品位标准要求,但目前还未见有产Ga锰矿床的报道.为了提升对此富Ga现象的认识,对其进行了碳、氧同位素特征研究.结果显示:矿石和围岩δ~(13)C_(PDB)值分别为-6.40‰~-2.20‰、-8.90‰~0.90‰,δ18 OPDB值分别为-9.00‰~-7.90‰、-9.90‰~-3.90‰.研究表明:(1)有机质参与了碳酸锰矿形成;(2)含锰岩系为热水沉积成因,Ga来源与海底热液活动密切有关;(3)海底热液活动一方面为形成锰碳酸盐直接或间接提供了大量有机质,另一方面为形成富Ga含锰岩系带来了大量Ga,被锰的氧化物或氢氧化物、海洋生物(多为热液微生物)所吸附、富集,经复杂的成岩、成矿作用而最终赋存于含锰岩系之中形成富Ga含锰岩系.
[Abstract]:In the manganese bearing rock series of Dongping Manganese Carbonate Mine, Guangxi, it is found that the high Ga content and the average content of Ga are 5.16 脳 10 ~ (-10) ~ (-6) ~ 82.80 脳 10 ~ (10) ~ (-6) and 33.76 脳 10 ~ (10) ~ (-6) ~ (6), respectively, which meet the requirements of the industrial grade standard for Ga ore resources. However, there have been no reports of the Ga-producing manganese ore deposits. In order to enhance the understanding of the Ga rich phenomenon, carbon has been carried out. The results show that the values of 未 ~ (13) C _ (DBB) of ore and surrounding rock are -6.40 鈥，

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